Help with kaw fc420, carb leaks gas

I recently repainted one of my mowers. It looks great. I put the engine on and it started right up. It smoked at first but the engine has been sitting for a year so I didnt worry. Figured it was water in the carb. I shut it down and came in to read some info on this site. When I returned to the mower it was leaking gas out of the tube coming out of the carb ( overflow tube ?) I dont know what to do. I have read in many threads that a good carb cleaning can do alot. I will go and clean it a few times while I wait and see if anyone has any info for me. I really dont want to take it to the shop if I dont have to. I used to mow part time and this is my first year full time. Money is tight at the moment. Any help would be great, thanks.